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Investment Securities - Summary of Continuous Loss Position of Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Investment [Line Items]    
Fair Value, Less than 12 months $ 935,513 $ 194,146
Gross Unrealized Holding Losses, Less than 12 months 35,128 1,109
Fair Value, 12 months or longer 22,785 70,017
Gross unrealized holding losses, 12 months or longer 324 859
Fair Value 958,298 264,163
Gross Unrealized Holding Losses 35,452 1,968
Government agency [Member]
    
Investment [Line Items]    
Fair Value, Less than 12 months 320,167 51,134
Gross Unrealized Holding Losses, Less than 12 months 16,223 248
Fair Value 320,167 51,134
Gross Unrealized Holding Losses 16,223 248
Residential mortgage-backed securities [Member]
    
Investment [Line Items]    
Fair Value, Less than 12 months 495,949 55,118
Gross Unrealized Holding Losses, Less than 12 months 15,303 127
Fair Value 495,949 55,118
Gross Unrealized Holding Losses 15,303 127
CMO's / REMIC's - residential [Member]
    
Investment [Line Items]    
Fair Value, Less than 12 months 63,857 74,784
Gross Unrealized Holding Losses, Less than 12 months 606 572
Fair Value, 12 months or longer 20,706 69,042
Gross unrealized holding losses, 12 months or longer 125 838
Fair Value 84,563 143,826
Gross Unrealized Holding Losses 731 1,410
Municipal bonds [Member]
    
Investment [Line Items]    
Fair Value, Less than 12 months 50,615 13,110
Gross Unrealized Holding Losses, Less than 12 months 2,921 162
Fair Value, 12 months or longer 2,079 975
Gross unrealized holding losses, 12 months or longer 199 21
Fair Value 52,694 14,085
Gross Unrealized Holding Losses 3,120 183
Other securities [Member]
    
Investment [Line Items]    
Fair Value, Less than 12 months 4,925   
Gross Unrealized Holding Losses, Less than 12 months 75   
Fair Value, 12 months or longer     
Gross unrealized holding losses, 12 months or longer     
Fair Value 4,925   
Gross Unrealized Holding Losses $ 75